Peely - the drone seems to have one sensor turret which can only point in one direction at a time despite having autoscan functions - that doesn't compare to a multicrew helicopter with the same turret plus people looking out of the window.
I have done enough sensor driven searches to know they are not a panacea and the human capability, as Evil Twin says, more often than not saves they day.
This belief that technology and AI is the solution to everything is always driven by those marketing the technology.